Middle school biology - NGSS
Organisms, and populations of organisms, are dependent on their environmental interactions both with other living things and with nonliving factors. Created by Sal Khan.
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- the five antelope in plain sight that he didnt circle 👁️💧👄💧👁️(23 votes)
- I wonder what would happen if we could understand animals(8 votes)
- cant the prey defeat the predator(9 votes)
- The name "prey" is given to those who are more likely to be eaten by another animal (e.x. a wolf and a rabbit, the rabbit is the prey). But, it is possible for multiple rabbits to attack the wolf, just not likely. Hoped this helped!(13 votes)
- Hello Everyone!
I need a bit of help understanding communities. What I don´t understand is, is a community the group of ALL living organisms in an area, or just a specific ones?
Thanks for any answers :)(8 votes)
- how much oxygen in a the water?(4 votes)
- Living organisms in lakes, rivers, streams, and oceans need oxygen to survive therefore dissolved oxygen is essential in an aquatic environment but unfortunately, it is not very abundant. While air consists of 21% oxygen, the oxygen content in water is only 0.001%!(3 votes)
- cant preys defeat the predator(5 votes)
- question,do plants go under the communities(4 votes)
- is coral truly a living thing? if so what do they give? or eat?(3 votes)
- Yes coral is a truly living thing, Corals get their food from algae living in their tissues or by capturing and digesting prey. Most reef-building corals have a unique partnership with tiny algae called zooxanthellae. The algae live within the coral polyps, using sunlight to make sugar for energy.And coral believe it or not protect coastlines from storms and erosion, provide jobs for local communities, and offer opportunities for recreation. They are also are a source of food and new medicines. Over half a billion people depend on reefs for food, income, and protection.(6 votes)
- [Instructor] In biology, it's useful to have some shared language so we can communicate and describe the world around us in ways that we can all understand together. So here, we're going to talk about populations, communities, and ecosystems. And as we will see, these are all related ideas. So first of all, a population is talking about the members of a specific species in an area. So for example, in this picture, we have a population of zebra. I have one zebra there, one zebra there, there might be some others that we can't see. In fact, there are likely to be. So, these are each members of a population of zebra. Now, we have other populations in this picture. We have a population of buffalo. These three are members of that population. We have a population of antelope. In fact, there is a bunch of antelope in this picture. So, we have many members of that population. We even see some animals here in the background. I can't quite make out what they are, but that could be a different population. Let's say if those are elephants, they might be elephants the way I see them, but that could be members of a population of elephants. So if that is a population, what is a community? Well, a community is all of the living species that live in the same area. So, we have a community of animals that is made up of populations of buffalo, of zebra, and of antelope. And I wanna make clear that the populations or when we're talking about the communities, we're not necessarily just talking about large animals like this. We could be talking about populations of mosquitoes. We could be talking about populations of fish in this pond, if there are any fish. We could have a population of a certain species of plant. And likewise, when we're talking about communities, we're talking about collectively all of the living organisms together. Now, last but not least, what would be an ecosystem then? Well, an ecosystem is all of the living organisms plus all of the non-living things. So, the ecosystem that we see here would also include the water, it would also include the dirt, it would also include the air. And organisms like those that we see right here are constantly interacting with both the living and nonliving parts of their environment. These interactions are how organisms get food, shelter, water, and warmth. These interactions are how organisms survive and produce offspring. So, let's get a little bit more practice with this idea of populations, communities, and ecosystems. And we will do that by looking at this picture right over here. Pause this video and think about what are the populations here? Well, you might not know the name of all these different types of fish, but you can see that there's a population of this gold-colored fish right over here. There's also another population of this blue-colored fish. We could keep looking for other populations. It looks like there's a population of this silver-colored or I guess long-ish silver fish right over here. But once again, it's not just the fish. There's a population of coral, there's populations of microorganisms that we can't see here. The community would be all of these living organisms that live close to each other. And we'll see, sometimes they compete with each other, sometimes they eat each other, but sometimes they help each other, Or sometimes they don't matter that much to each other. And we'll study that in a lot more detail. And then the ecosystem includes all of the above plus the water, plus the oxygen that is in the water, plus the sand at the bottom of the ocean. So, I'll leave you there. Hopefully, you now have a sense of what biologists are talking about when they talk about populations, communities, and ecosystems.